ZW7-40.5 Outdoor High Voltage Vacuum Circuit Breaker | Reliable Grid Protection | Chennuo Electric-Chennuo Electric Technology Group Co., Ltd

Feature

Compact & Space-Saving Design: Features a mid-set high-voltage vacuum circuit breaker configuration with the operation mechanism box located in the middle, reducing the external longitudinal length by 260mm compared to original models, making it ideal for installations with limited space.

Anti-Condensation & Eco-Friendly Structure: Uses novel filling insulation materials to prevent condensation inside porcelain sleeves and eliminates traditional oil or gas leakage and toxicity concerns.

Integrated Structure & Flexible Installation: Composed of integrated poles, current transformers, a motion mechanism, and a box body. The current transformers can be placed inside or outside the mechanism box for flexible installation.

Smart & Remote Control Capabilities: Can be combined with matching intelligent controllers to perform local switching operations or remote control via communication interfaces (supporting cable, optical fiber, GPRS/CDMA, GSM, etc.) to transmit data back to control centers.

Robust Environmental Adaptability: Designed to operate in surrounding temperatures from -30°C to +60°C, wind pressure up to 700pa (wind speed 34m/s), and III-class air pollution levels, with customizable options for high altitudes exceeding 4500 meters.

Parameter

Tech. parameters			unit	data
Rated voltage			KV	40.5
Rated insulation level	1min power frequency withstand voltage	Dry test	KV	95
	(Effective values)	Wet test	KV	80
	Lightning impulse withstand voltage (peak)		KV	185
Rated current			A	1250/1600/2000
Rated short-circuit breaking current			KA	20/25/31.5/40
Rated sequence of operations				min-0.3s-combine-180s-combine
Rated capacitor bank breaking current			A	400
Rated breaking times of short-circuit breaking current			Times	30
Rated short-circuit closing current (peak)			KA	50/63/80/100
Rated peak withstand current			KA	50/63/80
Rated short-time withstand current			KA	20/25/31.5/40
Rated short-circuit duration			S	4
Total breaking time			S	≤0.08
Mechanical life			times	20000
Rated operating voltage and rated voltage of auxiliary circuit			V	AC, DC 220, 110
Clearance between open contacts			mm	22±2
Contact contact stroke			mm	4±1
Average breaking speed			m/s	1.7±0.2
Average making speed			m/s	0.7±0.2
Contact closing bounce time			ms	≤3
The three phases non-synchronism			ms	≤2
Closing time			ms	≤150
Opening time			ms	≤60
The DC resistance of each phase circuit			(mΩ)	≤100

Environmental conditions:
1.Ambient air temperature: +60℃ to -30℃
2.Altitude not exceeding 2000m
3.Wind pressure not exceeding 700Pa (equivalent to wind speed of 34m/s)
4.No frequent severe movements
5.Air pollution level: Grade III

Typical Application Scenarios：

40.5kV Power Distribution Systems: Designed for 40.5kV, 50Hz three-phase power systems to act as a breaker for load current, overload current, and short-circuit current.
High-Voltage SVG Substation Loops: Suitable for use in high-voltage SVG (Static Var Generator) energy storage substation circuits acting as a main incoming line switch.
Limited-Space Outdoor Substations: Ideal for installations requiring reduced longitudinal dimensions (such as compact outdoor distribution setups or retrofitting older DW multi-oil circuit breaker systems).

Why Choose Chennuo Electric?

Proven Replacement Solution: Serves as the ideal, environmentally safe replacement for traditional oil-filled circuit breakers, eliminating maintenance hassles and hazardous leaks.
High Customization for Extreme Environments: Standard models support up to 2000m altitudes (with 710mm phase spacing), while offering flexible customized sizing and designs for extreme high-altitude installations up to 4500 meters and above.
Comprehensive Smart Integration: Offers seamless automation integration with multiple communication channel choices (optical fiber, wireless networks, etc.) to ensure real-time status updates and remote monitoring for smart grids.
Rigorous Manufacturing & Quality Standards: Built with high-quality steel enclosures and integrated pole structures designed to handle rigorous mechanical endurance and harsh outdoor working conditions.

Frequently Asked Questions (FAQ)

Q1: What is the main purpose of the ZW7-40.5kV circuit breaker?
A: It is designed for 40.5kV, 50Hz three-phase power distribution systems to make and break load currents, overload currents, and short-circuit currents, as well as serving as main incoming switches in high-voltage SVG storage substation circuits.

Q2: How does the ZW7-40.5kV prevent condensation and oil/gas leakage?
A: The circuit breaker uses novel filling insulation materials that prevent condensation on the outer sides of the vacuum interrupter and the inner walls of the porcelain sleeve. Furthermore, because it uses a vacuum as the insulation and arc-extinguishing medium, it completely eliminates oil or gas leakage and toxicity issues.

Q3: Can the ZW7-40.5kV operate in high-altitude regions?
A: Yes. For standard units, it is designed for altitudes up to 2000 meters (with a phase spacing of 710mm). However, it can also be custom-manufactured and installed in locations with altitudes of 4500 meters and above with tailored external dimensions.

Q4: What are the environmental and weather condition limits for this circuit breaker?
A: It is rated for surrounding air temperatures between an upper limit of +60°C and a lower limit of -30°C, a wind pressure of no more than 700pa (approx. 34m/s wind speed), no frequent severe vibrations, and a III-class air pollution level.